/*
 * Copyright @ 2018 - present 8x8, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jitsi.nlj.transform.node

import org.jitsi.nlj.PacketInfo

/**
 * A [NodePlugin] can be statically added to [Node] so that it
 * can function as an observer between every node created.  This
 * is useful for debugging things like when the backing array of
 * a packet changes throughout the pipeline.
 */
interface NodePlugin {
    /**
     * Invoked in between every node in any pipeline.
     * [after] is the [Node] which just processed the packet.
     * [packetInfo] is the [PacketInfo] being passed from one node to the next.
     */
    fun observe(after: Node, packetInfo: PacketInfo)
}
